File Conversions

WaltP · Post by **WaltP** » Tue Feb 05, 2008 1:53 am

I have a .WMV file (64.5M, 22146 frames, 12:18 minutes) that I want to convert to .AVI using VirtualDubMod. I open my .AVS file containing

Code: Select all

DirectShowSource("file name")

Then save the file as .AVI and after 10300 frames and 12.5 GIG of output, I cancel the conversion. Approximately 2 G per minute. An entire DVD Movie seems to be around 6 M/min

I'm very new to AVISynth (just a couple days) and have no idea why the file is so huge. The only documentation I've found seems to be geared to someone that already knows what happens during conversions and only explains functions and their parameters. In one case, it explains a function very well but absolutely no information on how to use the function.

Can anyone explain why the output file is so large, what can be done to get it in a range around 6-10M per minute?

kenzuka · Post by **kenzuka** » Tue Feb 05, 2008 5:35 am

Avisynth is just used to open your video for VDB. But the output format depends of the setting of vdb. You can change the output format by changing the setting in video->compression. For the codec to use, you need to use lossless codec, otherwise, you will have a loss in the quality of your vid, especially if you do not use filters to restore the quality.
So, we generally one of these two codecs:

lagarith better compression than the next one, but slower processing. I have a file of 3.28 GB for 11minutes of video in 640*360@25fps
huffyuv faster than the previous but bigger file at the end (from what I experienced, the file is generally 1.5 times bigger than the lagarith one)

WaltP · Post by **WaltP** » Wed Feb 06, 2008 12:52 am

Thanks, kenzuka. I tried both and they are too jerky.

Is there any documentation that deals with what you want to achieve and how to achieve it rather than just an explanation of functions?
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BasharOfTheAges · Post by **BasharOfTheAges** » Wed Feb 06, 2008 1:13 am

Lossless files are made to edit with. They are big, and will be jerky in playback if your computer isn't up to it, but in your editing software they will work correctly. for avisynth stuff i suggest you Read <a href=http://www.a-m-v.org/guides/avtech31/>ErMaC & AbsoluteDestiny's Friendly AMV Guides</a>. There are sections on filtering that explain several common filters that have historically been used here.